What is the story of Jolin Tsai’s movie The Agent?

Plot synopsis of "Agent J", the first part of "Agent's Destiny":

The mysterious Agent J (played by Jolin Tsai), who has no past and no records, receives an order to assassinate someone who has always been there. Tracking his professional bodyguard S (played by Kim Jae-won), the moment the mission was carried out, Agent J followed S to a rooftop. When S turned around and saw J's true face, before he died, he showed a familiar smile. At the same time, Agent J The mission was also completed... Since Agent J shot S, the familiar smile before S's death often lingered in Agent J's mind, so Agent J decided to start investigating and tracking who S was. In S's apartment, Agent J J discovered that he was actually the girl who disappeared suddenly two years ago. It turned out that S had been heartbroken in the past two years and had been waiting for the girl to reappear. He did not know that the agent J who was kidnapped by the secret organization had already been brainwashed... Ironically, S The rooftop where Agent J was shot was also the same rooftop where the girl and S agreed to meet. The beautiful agreement was a reunion in death. Agent J shot his past and love...

Conclusion: In The day I shot my love, I realized that love had been there before...

"Agent J" Part Two "The Crack of Memory" Synopsis: 02

Agent J is in prison Being scouted by a secret organization, he exchanged an assassination mission for his freedom. In the name of escaping from prison, he acted as a gangster; on the streets of London, Agent J, who transformed into an ordinary girl, was followed by an unknown person. In the process, he met the person responsible for the crime. Photographer Lu Xiaodong (played by Feng Delun), the two fell in love at first sight, and started a loving but uneasy love with Lu Xiaodong; during the period of their mad love, they discovered each other's true identity (JOLIN is Agent J, Xiaodong is Agent J). The secret agent commissioned by Blue Beard), the betrayal and trust between lovers are pulling against each other. Is it love in the end? Or hatred?

Conclusion: I have not lived unless I love

I do not exist unless someone sees me exist

"Spy J" III Part "Faith of Illusion" Synopsis: 03

In an undercover operation close to the underworld boss, Agent J unexpectedly discovered that his boyfriend Vince, who died in the line of duty many years ago, faked his death. Agent J was angry but Helpless, the two rekindled their love and fell into crisis! Agent J was assigned by a secret organization to rescue Vince, who was working as an undercover gangster, and V turned out to be his boyfriend who died many years ago. They had a fierce shootout and chase with the gangster. In the end, V actually died during an operation, leaving him to complete the mission. Agent J, who is alone, is so sad that she cannot believe that V has really left her this time...

Conclusion: None